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 Post subject: Working with stranded wire
PostPosted: Dec Sun 31, 2017 7:42 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3991
Location: Charleston, W.Va.
Here is a tip well known to most of us, but perhaps helpful to newer hobbyists who sometimes have difficulty when working with stranded wire:

When using stranded wire the individual strands tend to separate after stripping the insulation, thus making it difficult to achieve a neat tightly-crimped connection on a lug prior to soldering. This is even more true when the same lug also contains one or more additional component leads. A quick, easy procedure cures this: After stripping the wire (being careful to avoid any nicks in the individual strands), twist the strands together and apply a small drop of liquid or paste rosin flux. Then touch your well-heated soldering iron to the end of the wire, using a very small amount of solder. The result is a stranded wire whose end works as easily and neatly as solid wire. :)

This tip is by no means limited to point-to-point soldered connections in antique radios. It should also always be followed whenever stranded wire is to be placed beneath a screw terminal. Such as when replacing plugs or connectors on lamp or appliance cords, lamp sockets, switches, extension cords, etc.

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 Post subject: Re: Working with stranded wire
PostPosted: Jan Wed 03, 2018 4:11 pm 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 9490
Location: Powell River BC Canada
Stranded wire may have solderability issues. Bare copper strands can pickup
coatings from the insulation. The worst is rubber.

There are crimp lugs and solder lugs.

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 Post subject: Re: Working with stranded wire
PostPosted: Jan Wed 03, 2018 10:21 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3991
Location: Charleston, W.Va.
radiotechnician wrote:
Stranded wire may have solderability issues. Bare copper strands can pickup
coatings from the insulation. The worst is rubber.

There are crimp lugs and solder lugs.

Hi Steve,
What you say is very true. Bare copper stranded wire (i.e., un-tinned) whose strands have oxidized, or whose strands are contaminated with insulation, often present a challenge. Best practice in such a case is to carefully separate and straighten the strands, arrange them into a fan pattern (like a peacock's tail), carefully clean and tin each individual strand, then twist them back together. Needless to say, this is very time-consuming but sometimes it is necessary. Of course there is nothing wrong with using crimp or solder lugs as you mention, when the situation permits their use.

The above being said, my original "tip" was mainly intended for those new to this hobby who are using new or NOS pre-tinned stranded wire.

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 Post subject: Re: Working with stranded wire
PostPosted: Jan Thu 04, 2018 12:13 am 
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Joined: Oct Thu 18, 2007 11:34 am
Posts: 3557
Location: Port Orchard, Wa 98366
I have used wire strippers to almost remove the insulation off the end of the wire, soldered (or Tinned) the exposed wire then finished removing the insulation from the end and flush cut the very end of the wire before making a connection. I would also use round nose (needle nose type) pliers to make the wire form into a j-hook before wrapping the wire around turrets and terminals. makes the work easier.

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